Neither the play’s characterizations nor dialogue achieve the complexity of Margulies’ best works, and it all feels a little too neat in its set-up. But despite its schematic elements, Lunar Eclipse proves poignantly moving nonetheless thanks to its dramatic restraint and Kate Whoriskey’s pitch-perfect direction. Birney and Emery, who have long graced our stages, deliver impeccable work, never hitting a wrong emotional note and making us fully empathize with their characters — especially in a heartbreaking coda that depicts them at a very early stage in their relationship, getting together in the same field to witness a blood moon. Their superb work is abetted by the wonderful design elements including Grace McLean’s affecting music, Walt Spangler’s evocative set design, and Amith Chandrashaker’s lighting that gorgeously conveys every stage of that lunar eclipse.